If at all possible avoid going through walls or ceilings.
Walls: A correct thimble must be used.
Preferably use an all fuel fire stop spacer, thimble or connector. If a thimble is to be built, it must be three times the diameter of the pipe and well ventilated to allow air movement. Line inside framing with sheet metal.
Ceilings: When you must pass through a ceiling, the all fuel connector or fire stop spacer must be used and installed according to the manufacturers requirements.
Cut wall back three times the size of the pipe.
Example: 6′ pipe- 3 x 6″ = 18″
Frame hole with 2″ x 4″ and line exposed side of 2″ x 4″ with 22 ga. to 28 ga. sheet metal.
Pipes must be kept three times the pipe diameter away from combustibles.
All stove legs should be 4″ to 6″ long and stove must be on a stove board.
If protecting the rear of stove you should use 28 ga. sheet metal or 1/4″ asbestos millboard or both with non-combustible stands offs or spacers and a 1″ air space behind the metal or board.
The stove must be no closer than 36″ from unprotected combustible materials. ( brick, stone and asbestos cement board DO NOT PROTECT combustibles.
Below the stove should be 1/4″ asbestos millboard covered with sheet metal.